LDGJ Tactical Green & Red Dot Sight for Rifles & Shotguns - Includes Picatinny Cantilever Mount Co-Witness with Iron Sights - Coated Optic Engineered to Withstand Even the Toughest Conditions. Tailor the Brightness to Your Environment with 5 Brightness Levels for both Red and Green Illumination. Co-witness with standard height AR pattern sights. Mount Quickly and Securely with the Included Cantilever Mount.Backed by our No Questions 1 Year Warranty and Dedicated US Support. Note : The 1.5V Small button batteries will come with the product together for free . According to the new rules of the USA Customs ,the batteries must be installed in the product .Or it can't pass the customs inspection We have installed the batteries conversely . Just reinstall it after your got it .